Cirrus-logic CRD1611-8W Bedienungsanleitung PDF herunterladen (Seite 14)

CRD1611-8W

14 DS975RD5

7. INDUCTOR CONSTRUCTION

The CRD1611-8W includes a critical conduction mode (CRM) boost converter that provides power factor correction

and dimmer compatibility with a constant output current, quasi-resonant flyback stage. The following sections de-

scribe the boost and flyback inductors installed on the CRD1611-8W.

7.1 Boost Inductor

The CS1611 uses an adaptive dimmer compatibility algorithm to control the boost inductor stage, which guarantees

dimmer compatibility operation plus enables flicker-free operation with leading-edge, trailing-edge, and digital dim-

mers (dimmers with an integrated power supply). The boost auxiliary winding is used for zero-current detection

(ZCD) and supplies power to the CS1611.

Figure 10. Boost Inductor Schematic

7.1.1 Electrical Specifications

Characteristics conditions:

• Operating temperature range: -25 °C to +120 °C (including coil heat)

Notes: 7. Measured across pins 1 and 2.

8. Measured across pins 5 and 4.

Parameter Condition Symbol Min Typ Max Unit

Boost Inductor

Primary Inductance (Note 7)

resonant

=10kHz, 0.3V at 20°C

6.12 6.8 7.48 mH

Primary DC Resistance (Note 7)

DCR

=20°C

12 15 18 

Auxiliary DC Resistance (Note 8)

DCR

=20°C

0.84 1.05 1.26 

400T

#37AWG

(0.12mm)

22T

#37 AWG

(0.12 mm)

Primary

Auxillary

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 24 25

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Cirrus-logic CRD1611-8W Bedienungsanleitung Seite 14